scholarly journals Theoretical study of throttle valve system operation in the hydropneumatic shock absorber of the transport and technological machinery undercarriage

2021 ◽  
Vol 57 ◽  
pp. 562-572
Author(s):  
Sergei Repin ◽  
Polina Vasileva ◽  
Stanislav Evtykov ◽  
Sergei Maksimov ◽  
Irina Ruchkina ◽  
...  
Keyword(s):  
Shock Absorber ◽  
Theoretical Study ◽  
System Operation ◽  
Valve System ◽  
Throttle Valve

Researching on Valve System of Hydraulic Electromagnetic Energy-Regenerative Shock Absorber

2012 ◽  
Vol 157-158 ◽  
pp. 911-914 ◽  
Author(s):  
Zhi Gang Fang ◽  
Xue Xun Guo ◽  
Lin Xu ◽  
Jie Zhang
Keyword(s):  
Shock Absorber ◽  
Electromagnetic Energy ◽  
Hydraulic Motor ◽  
Additional Source ◽  
Valve System ◽  
Shock Absorbers ◽  
Oil Flow ◽  
Core Components ◽  
Flow Through ◽  
Regenerative Shock Absorber

Hydraulic electromagnetic energy-regenerative shock absorber is a new kind of shock absorbers, who can perform the function of a standard shock while acting as an additional source of power. One of the core components of this new shock absorber is the valve system. And its function is to rectify the direction of the oil flow. Then the oil can flow through the hydraulic motor from one port only no matter in expansion stroke or compression stroke. The research focused on the compactness, sensitivity and energy recovery rate of two different valve systems. And the results showed that the valve system composed of check valves better matched the hydraulic electromagnetic energy-regenerative shock absorber.

Outer Characteristics Simulation and Performance Analysis of Motorcycle’s Rear Shock Absorber

2014 ◽  
Vol 926-930 ◽  
pp. 806-809 ◽  
Author(s):  
Chun Xian Shan ◽  
Lu Cheng Sun ◽  
Mao Hong Sui
Keyword(s):  
Performance Optimization ◽  
Shock Absorber ◽  
Friction Model ◽  
Force Characteristic ◽  
Deformation Model ◽  
Damping Force ◽  
System Parameters ◽  
Valve System ◽  
Structure Improvement ◽  
And Performance

Motorcycle’s rear shock absorber has been built as a nonlinear mathematical model to analyze the shock absorber damping force characteristic. The model has been divided into various subsystems that including hydrodynamics flow model, friction model, elastic deformation model, and gas pressure model. It has been implemented in MATLAB/Simulink environment, and validated against experimental test data. The results show that the model is sufficiently accurate, the practical behavior of the shock absorber can be reproduced. The relationship between the valve system parameters and shock absorber outer characteristics has also been analyzed. Furthermore, the influence of valve system parameters is analyzed to provide some theoretical basis for the motorcycle shock absorber performance optimization and structure improvement.

Digital Control Damp Valve in Semi-Active Suspension

2012 ◽  
Vol 433-440 ◽  
pp. 2534-2540 ◽  
Author(s):  
Xiao Bin Ning ◽  
Ji Sheng Shen ◽  
Bin Meng ◽  
Jian Ruan
Keyword(s):  
Shock Absorber ◽  
Response Speed ◽  
Active Suspension ◽  
Fast Response ◽  
Stepping Motor ◽  
Flow Area ◽  
Control Precision ◽  
Throttle Valve ◽  
High Control ◽  
Electro Magnetic

It is known that for automotive semi-active suspension the damping of shock absorber shall be continuously adjustable. One approach for damping adjustment is via adjusting flow area of throttle valve of shock absorber using stepping motor. Throttle valve can be realized using electro-magnetic valve or any other type of driving valve. In order to be applied on semi-active suspension, the throttle valve is required to have high control precision, fast response speed, strong anti-pollution capability and etc.. In this paper a new type of digital valve is presented to control the flow area of shock absorber. The configuration is developed by the utilization of the two-motions-degree of freedom of a single spool. To solve the contradiction between the response speed and the quantitative accuracy which characterizes the previous valve of the same sort, a specially designed tracking program is adopted to the stepping motor control to smooth displacement output. Experimental results show that both static and dynamic performances of the digital valve can fulfill the requirement of semi-active suspension, which is valuable in the application of system such as semi-active suspension where the liquid flow needs to be controlled rapidly and accurately.

scholarly journals Frogs use a viscoelastic tongue and non-Newtonian saliva to catch prey

2017 ◽  
Vol 14 (127) ◽  
pp. 20160764 ◽  
Author(s):  
Alexis C. Noel ◽  
Hao-Yuan Guo ◽  
Mark Mandica ◽  
David L. Hu
Keyword(s):  
High Speed ◽  
Shock Absorber ◽  
Theoretical Study ◽  
Shear Thinning ◽  
Synthetic Polymer ◽  
Polymer Materials ◽  
Work Of Adhesion ◽  
Synthetic Materials ◽  
The World ◽  
Material Tests

Frogs can capture insects, mice and even birds using only their tongue, with a speed and versatility unmatched in the world of synthetic materials. How can the frog tongue be so sticky? In this combined experimental and theoretical study, we perform a series of high-speed films, material tests on the tongue, and rheological tests of the frog saliva. We show that the tongue's unique stickiness results from a combination of a soft, viscoelastic tongue coupled with non-Newtonian saliva. The tongue acts like a car's shock absorber during insect capture, absorbing energy and so preventing separation from the insect. The shear-thinning saliva spreads over the insect during impact, grips it firmly during tongue retraction, and slides off during swallowing. This combination of properties gives the tongue 50 times greater work of adhesion than known synthetic polymer materials such as the sticky-hand toy. These principles may inspire the design of reversible adhesives for high-speed application.

Computer Aided Valve Design of Shock Absorbers Used in Vehicles

2011 ◽  
Vol 486 ◽  
pp. 270-273 ◽  
Author(s):  
Ismail Gerdemeli ◽  
A. Engin Cotur ◽  
Eren Kayaoglu ◽  
Adem Candas
Keyword(s):  
Computer Program ◽  
Performance Test ◽  
Shock Absorber ◽  
Valve Design ◽  
Valve System ◽  
Shock Absorbers ◽  
Actual Application ◽  
Light Commercial Vehicle ◽  
The Right ◽  
Target Characteristics

The valve design of a rear twin tube shock absorber belongs to a light commercial vehicle whose damper characteristics already known has been realized by the help of a computer program called “Dr”, and compared with the actual application results. The program gives user results about the valve parts to get the right target characteristics. After obtaining the necessary parts’ results, the needed damping performance test has been performed by the shock absorber, which has been conflated according to the program. The actual results and target characteristics were compared. ”Dr” program enables the user to select the correct parts to be used in valve system by detecting every effect on target characteristics diagram. By comparing the overall effect of the parts selected, shock absorber valve system is conflated according to the valve components obtained from the computer program.

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